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SCHEDULE II (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
DOUBTFUL ACCOUNTS [Member] |  |  |  |  |  |
CHANGES IN RESERVES [Roll Forward] |  |  |  |  |  |
BALANCE AT BEGINNING OF PERIOD | $ 7,705 |  | $ 10,073 |  | $ 10,295 |
ADDITIONS TO INCOME | 5,584 |  | 6,011 |  | 7,242 |
CHARGED TO OTHER ACCOUNTS | 8,234 | [1] | 10,145 | [1] | 11,340 | [1]
DEDUCTIONS FROM RESERVES | 13,477 | [2] | 18,524 | [2] | 18,804 | [2]
BALANCE AT END OF PERIOD | 8,046 |  | 7,705 |  | 10,073 |
MISCELLANEOUS: Injuries and property damage [Member] |  |  |  |  |  |
CHANGES IN RESERVES [Roll Forward] |  |  |  |  |  |
BALANCE AT BEGINNING OF PERIOD | 4,540 |  | 3,603 |  | 3,228 |
ADDITIONS TO INCOME | 1,934 |  | 3,150 |  | 2,416 |
CHARGED TO OTHER ACCOUNTS | 0 |  | 0 |  | 0 |
DEDUCTIONS FROM RESERVES | 2,135 | [3] | 2,213 | [3] | 2,041 | [3]
BALANCE AT END OF PERIOD | 4,339 |  | 4,540 |  | 3,603 |
MISCELLANEOUS: deferred compensation [Member] |  |  |  |  |  |
CHANGES IN RESERVES [Roll Forward] |  |  |  |  |  |
BALANCE AT BEGINNING OF PERIOD | 14,205 |  | 13,474 |  | 12,571 |
ADDITIONS TO INCOME | 1,781 |  | 1,756 |  | 1,893 |
CHARGED TO OTHER ACCOUNTS | 0 |  | 0 |  | 0 |
DEDUCTIONS FROM RESERVES | 1,306 |  | 1,025 |  | 990 |
BALANCE AT END OF PERIOD | 14,680 |  | 14,205 |  | 13,474 |
MISCELLANEOUS: group medical claims incurred but not reported [Member] |  |  |  |  |  |
CHANGES IN RESERVES [Roll Forward] |  |  |  |  |  |
BALANCE AT BEGINNING OF PERIOD | 1,560 |  | 1,300 |  | 1,450 |
ADDITIONS TO INCOME | 17,205 |  | 15,381 |  | 14,171 |
CHARGED TO OTHER ACCOUNTS | 0 |  | 0 |  | 0 |
DEDUCTIONS FROM RESERVES | 16,116 | [3] | 15,121 | [3] | 14,321 | [3]
BALANCE AT END OF PERIOD | 2,649 |  | 1,560 |  | 1,300 |
Total MISCELLANEOUS [Member] |  |  |  |  |  |
CHANGES IN RESERVES [Roll Forward] |  |  |  |  |  |
BALANCE AT BEGINNING OF PERIOD | 20,305 |  | 18,377 |  | 17,249 |
ADDITIONS TO INCOME | 20,920 | [4] | 20,287 |  | 18,480 |
CHARGED TO OTHER ACCOUNTS | 0 | [4] | 0 |  | 0 |
DEDUCTIONS FROM RESERVES | 19,557 | [4] | 18,359 |  | 17,352 |
BALANCE AT END OF PERIOD | $ 21,668 |  | $ 20,305 |  | $ 18,377 |
[1] | Accounts reinstated, cash recoveries, etc.
[2] | Accounts written off.
[3] | Claims settled, less reimbursements from insurance companies.
[4] | Totals for the year ended September 30, 2013 includes one month of MGE activity.

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